Lens grinding and polishing machine



Jan. 12 1926.

Filed August 2. 1921 5 Sheets-Sheet 1 1 Jane 12 1926.

E. M. LONG LENS GRINDING AND POLISHING MACHINE Filed Augu 2, 1921 5 Sheets-Sheet 2 lNl-INTOR Y TTORNEY Jan. 12 1926.

E. MfLONG LENS GRINDING AND POLISHING MACHINE Filed August 2, 1921 5 Sheets-Sheet 5 I/NVENTOR 6721 Y Br )6 2 JYTTORNEY Jan. 12 1926.

E. M. LONG was GRINDVIING AND POLISHING MACHINE Filed August ,2. 1921 5 sheets-shed 5 'NVENTOR ATTORU EY Patented Jan. 12, i926.

UNITED STATES ELI MAYNARD LONG, OF GENEVA, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE STANDARD OPTICAL COMPANY, OF GENEVA, NEW YORK, INCORPORATED IN NEW YORK IN 1924.

LENS GRINDING AND POLISHING MACHINE.

Application filed August 2, 1921. Serial No. 489,187.

To all whom it may concern:

Be it known that I, ELI M. LONG, a citizen of the United States, residing at Geneva, in the county of Ontario, in the State of New York have invented new and useful Improvements in Lens Grinding and Polishing Machines, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to a machine for grinding and polishing the surfaces of lenses in which the lens is caused to traverse the surface of a rotary grinding or polishing lap to impart the desired surface contour to the lens, and refers more particularly to the driving mechanisms for the lap and lens-holding device and to the means for adjusting the lens-holder and holding it in its adjusted position.

In machines of this character in which fine emery, rouge and analogous materials are employed as the abrasive element, it is necessary to guard against the entrance of those materials into the bearings of; the movable parts to avoid excessive wear. of the bearings, and while one of the objects is to enclose practically all of the working parts exclusive of the lap and lens-block in a dust-proof housing or housings, the main object is to increase the general working eificiency and durability of the machine.

One of the specific objects is to provide means whereby the lens-holding device may be easily and quickly adjusted to different angles relatively to the axis of the rotary lap.

Another objectis to provide simple and efiicient means whereby the lens-holder may be reciprocated with a swinging oscillatory motion across the face of the lap with varying degrees of throw or arcs of movement.

Another object is to enable the are of movement of the lens-holder to be changed atwill while the machine is in action.

A further object is to enable the supporting bracket for the lens-holding device to be adjusted transversely and to different angles relatively to the axis of the lap and held' in both positions of adjustment by the operation of a single hand iece.

Other objects and uses relating to specific parts of the device will be brought out in the following description:

In the drawings: 1

Fig. 1 is a top plan of "a machine embodying the various features of my--invention, the table being artly broken away.

Fig. 2 is a fi'ont elevation of the same machine showing parts of the tray broken away to disclose the interior mechanism.

Fig. 3 is a transverseyertical sectional view of the same machine taken on line 33 Fig. 1. I r P Fig. 4 is a horizontal sectional View taken in the plane of line 44, Fig. 2.

Fig. 5is a horizontal sectional view taken in the plane of line 55, Fig. 2 except that the outer ends ofthe clutch levers are broken away and the frame of the machine omitted.

Fig. 6 is a detail vertical sectional view taken in the plane of line 6-6, Fig. 4:.

Fig. 7 is a detail horizontal sectional View taken in the plane of line 7+7, Fig. 3 showing the means for varying the throw of the lens-holder.-

Fig. 8 is a detail horizontal sectional view taken'in the lane of line 88, Fig. 3. Fig. 9 is a Vertical sectional view of the device =2 for reciprocating the lens-holder with the operating pin at an angle to its rock-shaft.

Fig. ,10 is a detail vertical sectional view taken on line 10-l0, Fig. 1.

Fig. 11 is an enlarged detail sectional view taken on line 11-1l, Fig. 2.

As illustrated this machine comprises the main supporting table -1-, a relatively stationary housing -2 and a waste receptacle '3- secured, respectively, by bolts -4- against the lower and upper faces of the table lfor receiving and enclosing the major portion of the mechanisms for controlling the operations of a rotaryv lap --5-, a lensholder --6 movable across the upper surface of the lap --5-, arelatively stationary post 7 mounted on the table justment about a orizontal axis, and mechanism for reciprocating the lens-holder across the upper face'of the lap and for permitting the adjustment of the lens-holding device to different angles relatively to the axis of the lap as will be hereinafter morefully explained.

The housing 2 comprises lower and upper sections 10- and --l1 rigidly but detachably secured together end to end by bolts 12, the upper section being provided with laterally projecting apertured lugs -l3 for receiving the clamping bolts -4 by which the housing is rigidly secured to the table 1.

The front portion of the lower section -l.is substantially semi-circular about a vertical axis, while the rear portion is offset rearwardly and is substantially semi-circular about a horizontal axis for receiving and supporting portions of the driving mechanism for the rotary lap -5, the bottom of the housing section being provided with an upstanding hub 10 coaxial with said axis for receiving the lower end of an upright shaft which also forms a part of the driving mechanism of the lap as will be hereinafter more fully, explained.

The upper end of the section 10 is provided with a circular opening registering with a similar opening in the lower end of the upper section 11, the securing of the two sections together by the bolts -12- serving to produce a dust-proof housing for the interior mechanism and also forms a reservoir for lubricating oil to the movable parts within the housing.

The upper end of the housing section --11- is reduced in diameter to form a circular hollow hub 14, which extends vertically through an opening l5 in the table 1 and some distance above the upper surface thereof where it is covered by a cap 16 telescoping therewith and around the outside thereof to prevent the entrance of dust or other waste material from grinding into the bearings of the movable parts within the housing. y

The waste receptacle 3 is clamped by the bolts -4 to the upper surface of the table 1 concentric with and around the axis of the tubular hub -14-- on the upper end of the housing and is provided with a central up-turned annular flange --17-- surrounding the lower portion of the cap -16, which in turn is provided with a down-turned marginal flange 18 cov ering and surrounding the upper end of the hub 17- directl below the lap 5- and also below the horizontal plane of the upper edge of rim of the receptacle --3- to deflect any waste material resulting from grinding the lens into said receptacle.

mounted in a horizontal position in suitable bearings 20- at opposite sides of the rearwardly projecting offset of the lower housing section -l0- and is provided with an external pulley 21- adapted to be connected by a belt to any available source of power (not shown) for rotating said shaft.

A vertical shaft 22- is journaled at its lower end in the hub 10 and extends upwardly through the hub 14 and cap .16 coaxial therewith, said hub 14 being provided with an internal bushing 23 in which the adjacent portion of the shaft is journaled.

This bushing is held against axial and rotary movement by means of a set-screw 24- passing through an opening in the adjacent side of the hub -14, the opposite side of said bushing being provided with .a lengthwise groove -2( communicating with an annular groove -27 in the upper end of the bushing whereby oil may be conducted to the interior of the bushing for lubricating the shaft 22-.

The upper portion of the shaft just above the upper end of the bushing 23. is provided with annular shoulders 28 against which the cap 16 normally rests.

The shaft 22' is also provided with a reduced threaded upper end 29 projecting above the upper face of the cap 16 and engaged by a nut 30 having a longitudinally tapered outer face upon which the lap -5 having a similar tapered socket is, frictionally fitted to rotate with the shaft 22, it being understood that the nut 30- serves, to clamp the cap -16 against the shoulders 28- on said shaft to cause the cap to rotate therewith and thereby to assist in throwing any dust or foreign matter whichmay lodge on the cap into the receptacle by centrifugal force.

A rotary clutch member 31- is loosely mounted u on the upright shaft '-22 and is provides at its lower end with a spiral gear 32- meshing with a similar spiral gear 33 which is secured to the countershaft -19 within 'the housing-section 10- as shown in Fig. 3 to impart relatively high speed rotary motion to thelamp 5-, the upper end of said clutch section being provided with an inner annular friction face -34 of relatively larger diam- "eter than that of the gear -32. The clutch-section -31 is somewhat conical and arranged with its larger end uppermost, the lower end together with the gear 32- being stepped upon ball-bear'ing's 35 on the upper end of the hub --10-- to resist downward thrust of those parts without excessive friction.

Another clutch section 36 is keyed by a pin --37- to the upright shaft -22- and engages the upper end of the loose clutchsection -31, thereby holding the loose clutch-section against upward displacement relatively to the shaft and at the same time permitting it to rotate continuously while the upright shaft with the section -36 and lap thereon remain at rest.

A series of, in this instance four, clutch levers -3Z-- are pivoted at 38 to the upper marginal edge of the cup-shaped clutch section --36 to rock vertically, and are provided with pendent lugs -39"- movable into and out of engagement with the clutch face -34- of the section 31 as the inner ends of the levers are rocked vertically in oposite directions.

The inner ends of Y the clutch levers -37' are pivotally connected by pins d() to the lower end of a collar 41, which is slidable vertically along the shaft 22-- between the clutch section --36 and lower end'of the bushing -23- and therefore within the housing 2, whereby" the downward movement of said collar -41- will force. the lugs --39 into frictional engagement with the clutch section 8lto cause the latter to rotate. with the v shaft -22- while a reverse upward movement of said collar will release the lugs -39 from the clutch section -31 to allow the upright shaft and lap carried thereby to remain at rest while the clutch section -31- continues to rotate through the medium of the gears -32 and 33-.

The means for reciprocating the collar a permit rotary adjustment when desired.

-A lever -49- is pivoted at -50 to the crank-arm 47 and extends downwardly some distance therefrom and terminates in a forwardly projecting handle or knee engaging member -5lwhereby it may be rocked laterally about the pivot A stud -52 is secured to the outerwall of thehousing -'2- some distance below lid the outerend of the rock-shaft -45-- and is provided with a roller -53- adapted to be engaged by a cam 54- on one side of with the frictional face -34.

the lever -49- Fig. 2 for moving said lever upwardly when the cam is rocked against the periphery of the roller -53 and thereby elevating the innerend of the forked arm -42 and collar -41- to 7 effect the release of the lugs --39-- from frictional engagement with the clutch face 34-, while on the other hand, the movement of the lever -49-- away from the roller -53 allows the inner end of the 7 forked lever 42 and collar 4l-- to descend for frictionally engaging the lugs This latter movement is, however, aided by a series of, in this instance four, vcoil springs 55 5Q havingtheir lower ends seated in sockets 5G in the upper end of the collar -41-- and their upper ends engaged with a washer 57 which in turn rests against the lower end of the bushing -23- and is provided 35 with guide pins -:58-- projecting into the coil springs to assist in holding the collar against lateral turning movement.

That is, when the lever -4=9 is forced to its releasing position, the springs -55- automatically force the collar- 11 downwardly thereby operating the levers 37-- to cause the lugs 39- to frictionally lock the clutch section -36- to the clutch section 31- and thereby to cause the rotation of the shaft -22- with the lap thereon. The pivotal connection -50;- between the crank-arm -.47-- and lever -49 is nor,- mally some distance to one side of a direct line between the stud --52- and axis of the 1% rock-shaft -45-, while the lever -'-51 is provided with a concave seat --(j0 movable into and out of a direct line between 1 the axes of the pivotal connection --50 and stud --52 so that when positioned in said line, it will automatically lock the crank-arm -47- and parts operated thereby in their clutch releasing positions against the actions of the springs --55'.

lens-holder operating means.

A counter-shaft -61 is journaled in a horizontal position in suitable bearings beneath the table -1- adjacent the lower end of the tubular post -7-- and therefore, 5 I

some distance to the rear side of the housing -2-., and is provided with a ,pulley 94%?- adapted to be connected by a belt to the same source of power as that which drives the lap-operating mechanism, said shaft being provided with a spiral gear --63-- meshing with asomewhat larger spiral gear -64e on the lowerend of an upright shaft -fi5- to impart relatively slow speed rotary motion to said shaft which extends vertithrough an opening in said table. A yoke ---6'?'-- is secured by a set-screw 130 and is 68- to the lower end of the post 7 rovided with a journal bearing 69 or receiving and supporting the adjacent end of the shaft -61 and thereby holding its gear 63'-- in mesh with the gear 64.

The lower and upper endsof the upright shaft 65- are ournaled in bushings 25-- in the corresponding ends of the posts -7, the upper 'end of said shaft being provided with a circular disk 70-' which is secured to the shaft by means of an upstanding spindle 7 1- parallel with but eccentric to the axis of the shaft -65 and collar 70, thereby serving as a key to lock said shaft disks to each other.

A hand piece 72- is journaled coaxially upon the spindle -7 1- and is provided with an offset cylindrical extension -73- which, however, is eccentric to the axis of said spindle and has its lower end normall resting upon the upper face of the disk 0- and provided with a downwardly projecting pin --74- adapted to enter an one of a series of, in this instance five, soc ets 75 in the upper face of said disk, said sockets being arranged circumferentially about the axis of the spindle 7 1'- and, therefore, eccentrically about the axis of the shaft 65-.

That is, the axis of the cylindrical hub +73- of the hand-piece -72 is offset fromthe axis of the spindle 71 approximately the same distance as the ofiset of the spindle from that of the shaft -65 so that when the hand-piece 72is adjusted rotarily to one position, the axis of its cylindrical hub ,73- will be substantially coincident with the axis of the shaft -65- but when adjusted from that position, the axis of the cylindrical portion 73-- will be gradually moved away from the axis of the shaft until it reaches its maximum distance therefrom, the handpiece with its cylindrical hub 73- being movable axially against the action of a retracting spring 77- to withdraw the pin from any one of the sockets 75 with which it ma be registered, it being understood that t e hand-piece will be automatically returned by said spring to cause its pin,74 to enter the registering socket to hold the hand-piece in its adjusted posi tion.

A collar --78 is journaled upon the cylindrical hub -73.- of the hand-piece 72 and is connected by a rod -79- and universal joint --80 to one end of a slide-rod -81- which is movable horizontally in a suitable guide-way 82 on 'the adjacent section of the bracket 9- which extends over the lap -5'- when the machine is in operation.

The bracket 9 is composed of relatively movable sections 83-- and --84--,

the section 83- being provided with a horizontally extending hub 85- 'ournaled in a suitable bearin 86-- on t e upper section of the clamping yoke -8- so as to swing about the horizontal axis at right angles to that of the shaft 65 for the clamping section --88 is loosely mounted around the tubular post 7 and has a convex upper face bearing againstthe under side of t e flange 89 to allow it to adjust itself to different tightening move.- ments of the clamping bolts 90 and 91- by which the clamping yoke 8- with the sectional bracket -9- thereon may be held in any position of an ular ad-.

justment about the axis of the sha t -65- or post 7.

The bearing 86- is split through one side and the clamping bolt -91- is passed through apertures in the opposite walls of the division for the purpose of tightening and releasing the bearin upon and from the hub 85 of the brac et section 83-, thus permitting said bracket section to be turned about an axis at right angles to that of the shaft -65 for varying the angle of the lens-holder relatively to the axis of rotation of the lap 5, while the swinging movement of the bracket 9-- as a whole about the axis of the shaft 65 enables the lens-holder to be moved toward and from the axis of rotation of the lap irrespective of the an 'le of adjustment of {he lens-holder relatively to the axis of the It is now clear that the clamping bolt -91- controls both of these ad ustments and in order that it may be conveniently tightened and loosened, its upper end is rovided with a cam lever 92 adapts to be operated by hand and provided with cam faces 93 for engaging similar cam faces on the adjacent face of the bearing thereon is caused to traverse the'surface of the lap.

V The bearing member -94: is clamped by means of a bolt 95 to the lower end of an upri ht rock-shaft 9 6jwhich is journale in suitable bearings ina lateral offset portion on the front end of the bracket section -84 at one side of a reciprocatory slide-rod -8land is provided with a pinion 98 meshing with a toothed rack 99- on the adjacent side of-the slidingrod --8l, whereby the shaft -96- is rocked about its axis and lens-holder 6- is bodily reciprocated or oscillated back and forth in curvilinear paths across the surface of the lap -6 as the rod -81 is 'reci rocated rectilinearly through the medium of; rotary eccentric 73--o and pitman 9.

The bearing member -94- preferably consists of a hardened steel pin pointed at both ends so that either end may be engaged in the recess -6- of the lens-holder 6, while the other end is inserted in one or the other ofa plurality of, in this instance two, sockets 100 and 10l-- in the lower end of the rock-shaft -96- where it is held in its adjusted position by" means of a clamping bolt -95- having openings therethrough registering with the sockets -100-' and '--10l, respectively,

One of thesockets as --lO0- and its corresponding opening in the clamping bolt 95- are disposed at an angle to the axis of the rock-shaft -96, while the other socket and its corresponding opening in the lid clamping bolt are parallel with said axis but both of the sockets and their openings. are preferabl located at opposite sides of the axis of t e rock-shaft so as toimpart more or less oscillatory motion to the pin and lens-holder as the shaft is rocked in reverse directions, it bein understood that when .the pin is inserte in the diagonal socket, the lens-holder actuated thereby will be moved through a longerarc than when inserted in the other parallel socket and that the radiusof movement may be varied by endwise adjustment of the pin.

In either case, however, the sweep or arc of movement of the bearing pin and lensholder may be varied by the rotary adjust ment of the hand-piece -72- to engage its holding I in the disk -70- bywhich adjustment the axis of the cylindrical eccentric -73-- will be brought closer-to or fartherv from the axis of the vertical shaft-65:1.

The bracket section -84-- in addition to its rotary adjustment in the bearing --86- about a horizontal axis and its: other adjustment about the vertical axis of the shaft --6& is also adjustable vertically relapin --74--" in difierent sockets tively to the bracket section -83-- for adjusting the pin -94- and its supporting means into and out of engagement with the lens-holder 6 and for this purpose,,the adjacent ends of the bracket sections -8fi and 84 are provided with dove-tailed connections to enable the section 84- to slide vertically on the section '83 which in turn is provided with an upright toothed rack -l 02- engaged by. a pinion -l03-- tion in its adjusted position along the rack The bearing member --94-- is preferably held in engagement with the tool-holder --6- under yielding pressure and for this purpose, the upper end of the rock-shaft -96 is covered by a cap 106 which is secured by screws -107- to the upper. face i of theofi'set portion -97- of the,v section and is provided with a series of, in this instance four, sockets --l08-- opening tit from the lower face thereof for receiving a a corresponding number of coil springs --1Q9- having their upper ends hearing against the top wall of the cap -'-106 and Will their lower. ends en ged with a bearing washer whic is loose on the rockshaft 96- and forms the up or hearing for anti-friotion balls 11l--, tli e latter being engagedwith an under-l ing washer on said rock-shaft, thus permitting the springs --109-- to exert continuously downward pressure upon the rock-shaft to hold the pin --94 in engagement with the lens-holder -6- and thereby to yieldingly press the H lens against the surface of the lap.

I Lubricating sy8tem..

' As previously stated, the housing 2- is adapted to contain a quantity of oil tor lubricating purposes, the. various movable parts contained therein bein immersed in oil but in addition to this portion of the selfoiling feature is provided an oil pump .-B- secured to and enclosed within the housing and provided at its lower side with an inlet nozzle and its op osite side with an outlet conduit c lea ing to the lengthwise channel -26- in the bushing lilt liili -23-, said pump being of the rotary piston type driven by suitable gearing d-- from the shaft -19-- to draw the oil through the outlet pipe on into the 'iengthwise channel 26- where it is tree to foltrance of the grinding waste and other materials which may affect the bearings detrimentally.

Operation.

-22- and lap 5- carried thereby, and

that the operating device for the lens holder has been adjusted to press the lens against the surface of the lap; then the rotation of the shaft will transmit oscillatory motion to the rockshaft -96-- through the medium of the slide-rod --81- and its connections with the eccentric 73 thereby causing the lens-holder -6- to traverse the surface of: the rotat ing lap with a reciprocatory motion.

The lens-holder device may be adjusted toward and from the axis of the la and also at different angles thereto by simply loosening the clamping lever 92 which loosens the clamping device 8- and splits bearing --86, thereby permitting the rotary adjustment of the clamping oke 8 with the bracket -9 thereon a out the axis of the shaft -65- and also permitting the bracket +9- to be adjusted rotarily about the axis of the hub the first adjustment being for the pur ose of moving the lens-holder toward and f i om the axis of the shaft -22, while the second adjustment serves to bring the lensholder at the desired angle relatively to the axis of said shaft 22- according to the curvature of the services of the lap -5-, these two adjustments being made to bring the axis of the rockshaft 9( approximately radial to the are of curvature of the lap surface.

Rocking the hand-lever -104 up and down will effect the desired pressure toward or release the lens-holder from the lap, aided by the coil springs 109-.

When the grinding or polishing operation is completed, the lever -49- may be shifted to cause the cam 5l to ride up the roller 53 and thereby to the crankarm ----4:7-- and its shaft -45 upwardly against the action of the springs 56- to release the clutch levers -37 from vengagement from the clutch section -31, thereby stopping the further rotation of the lap while the driving shafts -6land 19- continue to-rotate.

What I claim is:

1. In a lens-surface polishing machine, 7

the combination of a rotary lap, means for rotating said lap, a relatively stationary post parallel with the axis of the lap, a clamping head mounted upon and adjustable rotarily about the axis of said post, a E

bracket adjustable rotarily upon said clamping head about an axis at substantially right angles to that of the post, a rock-shaft journaled on the bracket, means actuated by the rock-shaft for moving the" lens across the surface of the lap, and means for rocking said shaft.

2. In a lens-grinding and polishing machine the combination of a lap, a lens-. holder, a rock-shaft, a bearing-member secured to the rock-shaft at one side of its axis for engaging said lens-holder, a pinion on the rock-shaft, a reciprocatory rack for rocking the shaft, and means for reciprocating said rack.

3. In a lens-grinding and polishing machine, the combination of a lap, a lensholder, a rock-shaft, a bearing member secured to the rock-shaft at one side-of its axis for engaging said lens-holder, a pinion on the rock-shaft, a reciprocatory rack for rocking the shaft, a rotary driving shaft, a' pitman connected to the rack, and adjustable connections between said pitman and] driving, shaft for varying the rectilinear movement of the rack and thereby varying the angular movement of the rock-shaft.

4. In a lens-grinding and polishing machine, the combination of a rotary lap and actuating means therefor, of a lens-holder movable across the face of the lap, 3. sup porting post, a yoke adjustable rotarily upon the post, a bracket adjusted rotarily upon the yoke and composed of sections one of which is adjustable transversely of the axis of rotation of the bracket, a rock-shaft journaled on said transversely adjustable section and provided with a bearing member for engaging the lens-holder, a driving shaft ,journaled in the post, and means for trans mitting motion from the driving shaft to the rock-shaft.

5. In a lens-grinding and polishing machine, the combination of a rotary lap and actuating means therefor, of a lens-holder movable across the face of the lap, a supporting post, a yoke adjustable rotarily upon the post, a bracket adjustable rotarily upon the yoke and composed of sections one of which is adjustable transversely of the axis of rotation of the bracket, a rock-shaft journaled on said transversely adjustable section and provided with a bearing member for engaging the lens-holder, a driving shaft journaled in the post, and m'eans for transmitting motion from the driving shaft to the rock-shaft, said means including a pitman adjustably connected to the driving shaft to vary its rectilinear movement.

6. In a lens-grinding and polishing ma chine, the combination of a rotary lap and actuating means therefor, of a lens-holder movable across the face of the lap, a rockshaft having a bearing point at one side of its axis for engaging the lens-holder, a support for the rock-shaft movable toward and from the lap, means including a rack and pinion for adjusting said supporting mem-'- her and means for operating the rock-shaft. 07. In a lens-grinding and polishing machine, the combination of a rotary lap and actuating means therefor, of a lens-holder movable across the face of the lap, a rockshaft having a plurality of sockets at an angle to each other, a bearing member adapted to be inserted in any one ofthe sockets for engaging the lens-holder, means for clamping the bearing member to the rock-shaft, a support for the rock-shaft, yielding connections between said support and rock-shaft for forcing the latter toward the lap, and means for operating the rock shaft.

8. In a machine for grinding and polish-' ing lenses, the combination of a rotary lap, a lens-holder movable across the face of the lap, a rock-shaft having a bearing-member for engaging and reciprocating the lensholder, a pinion on the rock-shaft, a support for the rock-shaft, a toothed rack slidable in said support and engaged with said:

erally and angularly relatively to the .lapsupporting spindle and rovided with a pin at one side of its axis or engaging a lens holder, and means for rocking the secondnamed spindle in reverse directions.

10. In a lens-grinding and polishing machine, a rotary grinding element, a lensholder, a rock shaft having a bearing pin adjustable endwise diagonally to the axis of rotation of-the rock shaft for engaging and moving the lens in a curved path about said axis across the surface of the grinding element, means for rotating the grinding element, and means for rocking said shaft in reverse directions.

11. In a lens-grinding and polishing machine, the combination of a rotary upright shaft, an oil containing housing therefor having bearings for the shaft, a driving shaft extending into the housing, means for transmitting motion from the driving shaft to the upright shaft, an oil pump within the housing having an inlet for receiving the oil and an outlet communicating with one of the bearings, means for transmitting motion from the driving shaft to the pump, a lap mounted in the upright shaft, a lens-holder reciprocally movable across the face of the lap, and means for operating the lensholder.

12. In a lens-grinding and polishing machine, a rotary grinding element, a lensholder, a rock shaft having a bearing member at one side of its axis for engaging and moving the lens-holder bodily about said axis as the shaft is rocked, supporting means for said shaft adjustable laterally about an axis parallel with that of the grinding element, means for rotating the grinding element at a relatively high rate of speed, and means driven at a relatively low rate'of speed for rocking said shaft in reverse directions and thereby to cause the lens-holder to be moved bodily in curvilinear paths across the face of the grinder.

In Witness whereof I have hereunto set my hand this 26th day of July, 1921.

ELI MAYNARD ose. 

